Sorção do herbicida imazaquin em Latossolo sob plantio direto e convencional

Oliveira, Maurílio Fernandes de; Colonna, Ignácio; Prates, H. T.; Mantovani, Evandro Chartuni; Gomide, R. L.; Júnior, Rubem Silvério de Oliveira

doi:10.1590/s0100-204x2004000800009

Cited by 15 publications

(12 citation statements)

References 15 publications

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“…It is known that its adsorption determines how much of the herbicide will be sorbed to the soil matrix and how much is available in the solution. For weak acid herbicides low soil pH provides higher adsorption (Bresnaham et al, 2000;Madani et al 2003;Oliveira et al, 2004), which are less available to plants. The rice soils of Rio Grande do Sul state are predominantly acidic in its natural condition, and approximately 50% of them have pH lower than 5 (Anghinoni et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

Carryover of Imazethapyr + Imazapic on Ryegrass and Non-tolerant Rice as Affected by Thickness of Soil Profile

et al. 2015

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-Herbicides used in Clearfield ® rice system may persist in the environment, damaging non-tolerant crops sown in succession and/or rotation. These damages vary according to soil characteristics, climate and soil management. The thickness of the soil profile may affect carryover effect; deeper soils may allow these molecules to leach, reaching areas below the roots absorption zone. The aim of this study was to evaluate the effect of the thickness of soil profile in the carryover of imazethapyr + imazapic on ryegrass and nontolerant rice, sown in succession and rotation to rice, respectively. Lysimeters of different thicknesses (15, 20, 30, 40, 50 and 65 cm) were constructed, where 1 L ha -1 of the imazethapyr + imazapic formulated mixture was applied in tolerant rice. Firstly, imidazolinone-tolerant rice was planted, followed by ryegrass and non-tolerant rice in succession and rotation, respectively. Herbicide injury, height reduction and dry weight of non-tolerant species were assessed. There was no visual symptoms of herbicide injury on ryegrass sown 128 days after the herbicide application; however it causes dry weight mass reduction of plants. The herbicides persist in the soil and cause injury in non-tolerant rice, sown 280 days after application, and the deeper the soil profile, the lower the herbicides injury on irrigated rice.Keywords: degradation, imidazolinone, Lolium multiflorum, leaching, Oryza sativa. (15, 20, 30, 40, 50 RESUMO -Os herbicidas usados na cultura do arroz

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Section: Resultsmentioning

confidence: 99%

Carryover of Imazethapyr + Imazapic on Ryegrass and Non-tolerant Rice as Affected by Thickness of Soil Profile

et al. 2015

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“…Trabalho realizado por Oliveira et al (2004) evidenciou influência do pH na retenção de herbicidas. A retenção do imazaquin foi maior nas áreas com menores valores de pH e altos teores de matéria orgânica.…”

Section: Introductionunclassified

Lixiviação de saflufenacil e residual após períodos de seca

et al. 2012

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RESUMO -O objetivo deste trabalho foi avaliar a lixiviação de saflufenacil em Latossolo Vermelho-Amarelo (textura média, pH 5,6) e Latossolo Vermelho distrófico (textura argilosa, pH 5,2 e pH 6,0), assim como os efeitos de períodos de seca no residual desse herbicida. A lixiviação de saflufenacil (0,10 g i.a ha -1 ) e, adicionalmente, a lixiviação de diuron + hexazinone (1.170 + 330 g i.a. ha -1 ) foram avaliadas sob simulação de chuva (40 mm). O herbicida saflufenacil aplicado em solo argiloso com pH 6,0 apresentou lixiviação até a profundidade de 25 cm, porém ela foi mais pronunciada na faixa de 15 a 20 cm. Quando o herbicida foi aplicado no mesmo solo, mas com pH 5,2, houve lixiviação até a profundidade de 15 cm. Em solo de textura média, a lixiviação foi elevada até a profundidade de 25 cm. Para diuron+hexazinone, no solo argiloso, independentemente do pH, houve lixiviação até 25 cm de profundidade. Todavia, em solo de textura média a lixiviação ocorreu até 40 cm de profundidade. Em relação ao efeito residual do saflufenacil após períodos de seca (0, 15, 30, 45, 60 e 90 dias) em um Latossolo Vermelho distrófico (textura argilosa), foi verificado efeito fitotóxico no bioindicador maior ou igual a 80% até os 28 dias de seca.Palavras-chave: calagem, comportamento, herbicida, solo.ABSTRACT -This work aimed to evaluate saflufenacil leaching in Red Yellow Latosol (medium texture, pH 5.6) and Dystrophic Red Latosol (clay texture, pH 5.2 and 6.0) and to evaluate the effect of drought on the residual herbicide. The leaching of saflufenacil (0.10 g a.i. ha -1 ) and hexazinone + diuron (1,170 + 330 g a.i. ha -1 ) was evaluated under simulated rainfall of 40 mm. Saflufenacil in clay soil with a pH of 6.0, showed leaching at a depth of 25 cm, but was more pronounced in the range between 15 and 20 cm. When the herbicide was applied in the same soil with pH 5.2, leaching occurred at depths of 10 to 15 cm. In medium texture, soil leaching occurs up to a depth of 25 cm. In the case of diuron + hexazinone, leaching can be seen in clay soil, regardless of pH, up to a depth of 25 cm, up to a depth of 40 cm in medium soil. Regarding the residual effect of saflufenacil after periods of drought (0, 15, 30, 45, 60 and 90 days) in (clay) Latosol, a phytotoxic effect on the bio-indicator, greater than or equal to 80%, was observed at 28 days of drought.

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“…Given the above, Ying & Williams (2000) reported that oxadiazon is highly sorbed in the soil, with high K d , varying from 23.43 to 28.07 mL g -1 , and K oc, of 2.343 to 2.718 mL g -1 , in soils with pH 7.2, 45.5% of clay and 1.00% of OC and with pH 4.7, 3.0% of clay and 0.86% of OC, respectively; from these results, the authors claim that the sorption of oxadiazon is clearly not related to the clay content of the soil, but with the OC content. The highest values of this coefficient are indicative of better retention of the herbicide by the soil and, consequently, less leaching (Oliveira et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

“…The imazaquin sorption is higher in samples with lower pH values and higher levels of OM; therefore, the effect of the OM on retention of imazaquin is pH dependent (Oliveira et al, 2004). Conditions of soils with low pH values tend to increase the interaction between molecules of the herbicide and the colloids in the soil, especially by the OC (Berglof et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

et al. 2014

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-The objective of this study was to evaluate oxadiazon sorption in different soils of the Brazilian Cerrado, highlighting the correlations of lethal doses of this herbicide capable of inhibiting 50% of the dry matter accumulation of the bio-indicator (LD50) among the chemical characteristics of the soil and its direct and indirect effects. The experiment was carried out in a greenhouse in a randomized block design and four repetitions. Each experimental unit consisted of a pot with increasing rates of oxadiazon and oat (Avena sativa), as the bio-indicator species. For sorption evaluation, washed sand and 22 soils (substrates) from Cerrado Brazilian's Alliaceae cultivated areas were used. LD50 and sorption ratio (SR) = [(LD50soil -LD50sand)/ LD50sand] to the substrates were determined. Pearson correlation analysis was performed between the chemical characteristics of the substrates and the LD50 of oxadiazon. A path analysis was quantified, to deploy only the significant correlations estimated in direct and indirect effects of the characters on LD50, which is a basic variable. A more pronounced LD50 (528.09 g ha -1 ) for the Cerrado soil sample resulted in higher SR (> 53.00), while in the washed sand substrate, LD50 corresponded only to 9.74 g ha -1 of the oxadiazon (available in soil). It was concluded that oxadiazon sorption is influenced by the chemical characteristics of the soils, highlighting the correlation with pH (CaCl 2 ), magnesium content, aluminum, organic matter, organic carbon, and aluminum saturation.Keywords: bioassay, neutral herbicide, organic matter. RESUMO -Objetivou-se neste estudo avaliar a sorção do oxadiazon em diferentes solos do Cerrado Brasileiro, destacando as correlações da dose letal do herbicida capaz de inibir 50% do acúmulo da massa seca do bioindicador (DL50) entre as características químicas do solo e seus efeitos diretos e indiretos. O experimento foi realizado em casa de vegetação, com delineamento em blocos casualizados com quatro repetições. Cada unidade experimental foi constituída de um vaso com doses crescentes do oxadiazon; utilizou-se a aveia (Avena

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Sorção do herbicida imazaquin em Latossolo sob plantio direto e convencional

Cited by 15 publications

References 15 publications

Carryover of Imazethapyr + Imazapic on Ryegrass and Non-tolerant Rice as Affected by Thickness of Soil Profile

Carryover of Imazethapyr + Imazapic on Ryegrass and Non-tolerant Rice as Affected by Thickness of Soil Profile

Lixiviação de saflufenacil e residual após períodos de seca

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

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